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determine total memory used by some user/process

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# 1  
Old 08-12-2009
determine total memory used by some user/process

HI guys,

Smiliei would like to know how can i determine
the total/approx memory used by a single user. Example Top output is below

top - 20:00:50 up 24 days,  2:48,  2 users,  load average: 0.43, 0.40, 0.37
Tasks: 172 total,   2 running, 170 sleeping,   0 stopped,   0 zombie
Cpu(s):  4.3% us,  0.7% sy,  0.0% ni, 95.0% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:  24954784k total, 23561312k used,  1393472k free,   318788k buffers
Swap:  2031608k total,        4k used,  2031604k free, 21011868k cached

 7172 rtx       16   0 73696  34m 3352 R   10  0.1 247:50.05 mysqld
 5189 rtx       16   0  322m 316m 4268 S    3  1.3  60:50.34 some.f
 5193 rtx       16   0  327m 321m 4264 S    2  1.3  60:14.19 some.f
16015 rtx       15   0 73696  34m 3352 S    1  0.1 139:45.09 mysqld


From the Top output above i found that the memory usage is about 94%. There are about 45 processes owned by "rtx" user.Am wondering if there is any method i

Last edited by vgersh99; 08-12-2009 at 04:43 PM.. Reason: code tags, PLEASE!
# 2  
Old 08-12-2009
Your server looks pretty healthy. Don't be fooled by the 94% you're seeing there. The way that that is reported isn't truly accurate. Buffers and cache are shown as "used memory" but in fact they are available to the system if needed.

For example, if I look at the server I'm working on right now, using top, I see:
top - 11:23:56 up 32 days, 11:11, 37 users,  load average: 2.79, 4.63, 4.55
Tasks: 365 total,   3 running, 362 sleeping,   0 stopped,   0 zombie
Cpu(s): 28.1% us, 11.4% sy,  0.5% ni, 46.2% id, 13.8% wa,  0.0% hi,  0.0% si
Mem:   3984940k total,  3666912k used,   318028k free,     2156k buffers
Swap:  2096472k total,     2136k used,  2094336k free,  2533372k cached

This makes it look like my memory is all used up. (in fact, I'm 2 meg into swap which I don't like. I'll have to look at that.)

But if I look at it using "free":
             total       used       free     shared    buffers     cached
Mem:       3984940    3934792      50148          0       3348    2628640
-/+ buffers/cache:    1302804    2682136
Swap:      2096472       2136    2094336

You can see, from the bolded line, that if you factor out buffers/cache (which you should) I have about 2.5GB of "free" memory. What's most important when looking at top for memory usage (at least in my opinion) is to look at the amount of swap used. Swap should never be used. If it is it's indicative of a problem. Memory leak, underpowered server, etc.

That being said, if you want to know usage for a user you should use 'ps' and then extract the data from there. You can grep by the user name and then use awk to extract the field you want and perform calculations on it.
# 3  
Old 08-12-2009
ps -u <user> -lf -o user,comm,vsz

This will provide virtual memory used per process owned by a user.

Last edited by Padow; 08-12-2009 at 05:11 PM.. Reason: Added code brackets
# 4  
Old 08-12-2009
Hi mglenney & Padow ,

Thanks alot for your replies, i have finally found out that with awk i can find out what i need.Thanks again for your support and have a great day Smilie

#ps aux | grep --exclude=grep rtx | grep -v grep | awk 'BEGIN{s=0;} {s=s+$6;}END{print s;}' // for total memory

#ps aux | grep –exclude=grep rtx |grep –v grep | awk ‘BEGIN{s=0;} {s=s+$6;} END {print s/45;}’ // for average memory

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